查询词典 friction coefficient

Circular and catenary always represent the shapes of minor principal stress soil arch between two parallel walls, but which shape should be used in the calculation of active earth pressure on two parallel walls remains disputed. Considering fully developed wall friction or partially developed wall friction, circular and catenary, the two shapes of minor principal stress soil arch between two parallel walls are theoretically analyzed. According to the shapes of soil arch, the coefficients of earth pressure corresponding to different angle of internal friction and that of wall friction are obtained, and the formula of active earth pressure on two parallel walls is derived.

鉴于计算平行墙间侧土压力时关于土体小主应力拱形的选择尚存在争议，考虑墙土摩擦角充分发挥和部分发挥两种情况，对平行墙间土体小主应力圆弧拱和悬链线拱分别进行了分析，得到了对应于不同内摩擦角和墙土摩擦角的侧上压力系数，以及平行墙间侧上压力的理论公式。

As the results, both the friction and wear are much lower in n-monohydric alcohols than in water; in ethanol, the friction and wear increase rapidly when a small amount of water was blended into the lubricant; the friction and wear decrease slightly with increasing the chain length in n-alcohols; in polyhydric alcohols, the increase of the hydroxyl number greatly reduces the friction and wear.

研究结果表明，陶瓷在醇中的摩擦和磨损均比水中低；在乙醇中加入少量水可明显增大其摩擦和磨损；随着一元醇分子链长的增加，其摩擦磨损略有降低；多元醇中羟基数目越多，其摩擦磨损越低。

The friction factor of glass reinforced plastic mortar pipe and typical soil of Shanghai, the develop characters of friction and the effect of injecting slurry on the frictional characters are got through the experiments. The result shows: the ektexine of glass reinforced plastic mortar pipe is slipperier than concrete pipe; injecting slurry could minish the friction between soil and pipe, but the effect of minishing friction is bear

然后通过对玻璃钢夹砂顶管进行摩阻力特性整管试验与直剪试验研究，得到了玻璃钢夹砂顶管外壁、混凝土与上海地区典型土层间的摩擦系数，以及玻璃钢夹砂顶管外壁摩阻力的发展特性，并且分析了注浆

Introduce the cohesion-friction model of rock strength theory, and extend the model to select the strength of sliding plane, discuss the variation rules of peak strength and residual strength under different normal stress, and then present the selection model of shearing strength. After the result of cohesion-friction model is compared with Coulomb Criterion, it is found that when the results of shearing strength are many and adjacent the strength parameters can not be regressed by least square method, instead the results should be divided into some beelines at that time according to the cohesion-friction model.(4) Discuss the characters of hard structural plane and weak structural plane: The adhesive friction theory is applied to research the changing course of shear area of hard structural plane and its influence on shear stress.

3介绍了岩石强度理论中的粘接摩擦模型，运用此模型分析依附型滑动面的演化过程，并将其推广到边坡岩土体抗剪强度的选取，讨论了不同法向应力下峰值强度和残余强度随法向应力的变化规律，在此基础上给出抗剪强度的选取模式，讨论了对实际取值结果的影响，并与传统的Coulomb准则进行了比较分析，指出直剪试验的法向应力在小应力区的点较多且抗剪强度结果差异不大时，不宜直接运用最小二乘法回归抗剪强度参数，此时应结合粘接摩擦模型对结果进行线性分段。

All the actuators of the three-axis turntable are brushless torque motors, all the bearings are aerostatic air bearings, so the friction caused by these elements can be neglected. The main source of friction is the metal-to-metal friction on the slip rings. Hence the "Columb+Viscous+Static" friction model is used here for analysis.

由于三轴转台的驱动系统选用的是无刷电机，轴承则采用的是气浮轴承，轴系上的摩擦力已大大降低，三轴转台上的摩擦主要是滑环轴上金属对金属的摩擦，所以文中选用&库仑＋粘滞＋静摩擦&的摩擦模型来进行分析。

Because the error mainly comes from theresonant region, the error correction method can only be used in resonant region, andcan effectively improve the efficiency of the statistical analyzing solutions. Two types of the mistuned bladed disks, whose friction damping are blade dryfriction damping and blade-to-blade dry friction damping, are modeled respectively. Amulti-harmonic method which can employ the fast Fourier transformationtechnique is proposed to investigate the vibratory response of the bladed disks withthese two types of nonlinear friction damping. Formulations of the solution for thesetwo types of motion functions are deduced. The characteristics of the forced responseof the bladed disks with these two dry friction damping are analyzed and summarizedunder various system parameters. The vibratory response of the bladed disk with dryfriction scatter mistuning is investigated.

针对叶盘系统中两类主要的非线性干摩擦阻尼形式，分别建立了具有叶片干摩擦阻尼和叶间干摩擦阻尼的失谐叶盘系统的非线性力学模型；提出了一种可利用快速傅立叶变换技术的多谐波分析方法；分别推导了具有这两类干摩擦阻尼形式的叶盘系统运动方程的求解公式；在各种系统参数条件下，研究了干摩擦阻尼失谐叶盘系统的受迫振动响应特性；对具有干摩擦散乱失谐的叶盘系统振动响应进行了研究，分析总结了干摩擦散乱失谐对叶盘系统振动响应特性的特殊影响规律。

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The friction characteristics of polyurethane for the friction liner of hoisting were studied. It was found that the dynamic friction coefficient of polyurethane increases with sliding velocity in the range of 0.01 to 0.4 mm/s and decreases beyond 0.4 mm/s.

本文研究了聚氨酯弹性体摩擦衬垫材料的摩擦特性，发现聚氨酯弹性体材料的动摩擦系数是和滑动速度有关的，在0.01～0.4mm/s的速度范围内，速度提高摩擦系数上升，在更高的速度下摩擦系数还会下降。

In the course of FEM model building, tensile test experiment is taken to work out the real stress-strain curve. Ring compress test is also done in this paper, through which the friction coefficient is worked out and the friction mechanism and relevant friction model for tube stagger spinning is studied. The experiments ensured the veracity and reliability of the FEM modeling.

建模过程中，通过材料拉伸试验测定了旋压材料00Ni12Cr5Mo4TiAlV时效钢的真实应力应变曲线；利用圆环镦粗试验测定了材料在不同润滑状态下的摩擦系数，并对强力旋压的摩擦性质和摩擦模型的选择进行了研究，确保了建模关键参数的准确性和可靠性。

In the paper, the friction coefficient of the friction pairs of Al2O3 matrix ceramic/45# steel during sliding experiments were studied, and the worn trace's micrographs of Al2O3 matrix ceramic were observed and analyzed, and the wear mechanism of Al2O3 matrix ceramic in dry friction and oil Iubrication were analyzed.

摘 要：本文对Al2O3基陶瓷材料/45#钢摩擦副的摩擦系数与45#钢/45#钢的摩擦系数作了对比滑动摩擦试验研究，观测分析了Al2O3基陶瓷材料磨痕形貌，并就干摩擦，油润滑状态下Al2O3基陶瓷材料的磨损机理进行了分析。

Some questions asked by the adjudicators in one English Speaking Contest still run upon me very often.

我参加了一场以"我心中的奥运会"为主题的英语演讲竞赛，其间评判提的几个问题时时萦绕我的心头。

He called InTERActive our most profitable release of the year.

他呼吁互动的我们的最有利可图的释放一年。